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A 7 pin to 13 pin adapter is most commonly used when you have a towbar fitted with 7 pin electrics for a trailer, but you want to attach a cycle carrier which has a 13 pin plug. It can also be used to plug in a caravan which has a 13 pin plug.
It is important to remember that the adapter will only extend the 7 pin functions, for example it will provide power the for the normal road lights. It can't however add the extra functions that are provided by a full 13 pin installation, so it won't power the reverse light on your cycle carrier or caravan, and it won't provide any of the battery charging or interior power to a caravan.
A 13 pin to 7 pin adapter is used when you have 13 pin caravan electrics on your car, but you want to tow a standard trailer, or use a cycle carrier which has a 7 pin plug.
A 13 pin to twin socket adapter is used when you have a 13 pin socket on your car and you need to tow an older caravan that has twin plugs.
These adapters are often required when you have a detachable towbar fitted and want to tow an older caravan. This is because the electric socket on most detachable towbars folds away when not in use, so there is no room to fit twin sockets. Instead we fit 13 pin electrics and you would need the adapter as well.
13 pin to twin socket apapters are available in two types; A compact one piece plug in adapter which is neater, however the is not always enough room around the 13 pin plug on your car to use this type of adapter. In this case you need the 13 pin to 7 pin adapter which has a 13 pin plug and 2 separate wires for the twin sockets, this isn't as neat, but it will fit in all cases. If you're in doubt about which would be best for you, please just get in touch.
You can obviously already tow a trailer with 7 pin electrics, because you would just use the single black socket, so no adapter is needed.
If you have an existing towbar fitted with twin electrics and you buy a new caravan with 13 pin electrics, you can save the need to modify the electrics on your car by using a twin to 13 pin adapter.